WO2022078292A1 - Procédé exécuté par un équipement utilisateur et équipement utilisateur - Google Patents

Procédé exécuté par un équipement utilisateur et équipement utilisateur Download PDF

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Publication number
WO2022078292A1
WO2022078292A1 PCT/CN2021/123081 CN2021123081W WO2022078292A1 WO 2022078292 A1 WO2022078292 A1 WO 2022078292A1 CN 2021123081 W CN2021123081 W CN 2021123081W WO 2022078292 A1 WO2022078292 A1 WO 2022078292A1
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Prior art keywords
communication
user equipment
sidelink
pssch
sideline
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PCT/CN2021/123081
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English (en)
Chinese (zh)
Inventor
赵毅男
罗超
刘仁茂
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夏普株式会社
赵毅男
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Priority to US18/031,154 priority Critical patent/US20230379121A1/en
Publication of WO2022078292A1 publication Critical patent/WO2022078292A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/40—Resource management for direct mode communication, e.g. D2D or sidelink

Definitions

  • the present invention relates to the technical field of wireless communication, and in particular, to a method performed by a user equipment and a corresponding user equipment.
  • D2D communication (Device-to-Device communication, direct device-to-device communication) refers to a direct communication method between two user equipments without being forwarded by a base station or a core network.
  • 3GPP 3rd Generation Partnership Project
  • the upper layer supports unicast (Unicast) and multicast (Groupcast) communication functions.
  • LTE Release 13 eD2D The main features introduced by LTE Release 13 eD2D include:
  • V2X stands for Vehicle to everything, hoping to realize the exchange of information between vehicles and all entities that may affect vehicles, with the purpose of reducing accidents, slowing traffic congestion, reducing environmental pollution and providing other information services.
  • the application scenarios of V2X mainly include four aspects:
  • V2V Vehicle to Vehicle, that is, vehicle-to-vehicle communication
  • V2P Vehicle to Pedestrian, that is, the vehicle sends a warning to pedestrians or non-motor vehicles
  • V2N Vehicle to Network, that is, the vehicle is connected to the mobile network
  • V2I Vehicle to Infrastructure, that is, communication between vehicles and road infrastructure.
  • V2X stage 1 introduces a new D2D communication interface called the PC5 interface.
  • the PC5 interface is mainly used to solve the communication problems of cellular vehicle networking in high-speed (up to 250 km/h) and high-node density environments. Vehicles can interact with information such as position, speed and direction through the PC5 interface, that is, vehicles can communicate directly through the PC5 interface.
  • the functions introduced by LTE Release 14 V2X mainly include:
  • the second phase of the V2X research topic belongs to the research scope of LTE Release 15 (see Non-Patent Document 4).
  • the main features introduced include high-order 64QAM modulation, V2X carrier aggregation, short TTI transmission, and a feasibility study of transmit diversity.
  • PT-RS is used to track phase fluctuations over the entire transmission period (eg, one slot). Since PT-RS is designed to track phase noise, PT-RS is dense in the time domain and sparse in the frequency domain. Similarly, the sidelink communication phase tracking reference signal sidelink PT-RS is also introduced in the NR sidelink. In the high frequency band, the user equipment performs phase tracking according to the received PT-RS to improve the demodulation performance.
  • the solution of the present invention mainly includes a method for determining the sidelink PT-RS sequence, and a method for determining the sidelink PT-RS mapping in the time domain.
  • Non-patent document 1 RP-140518, Work item proposal on LTE Device to Device Proximity Services
  • Non-patent document 2 RP-142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services
  • Non-patent literature 3 RP-152293, New WI proposal: Support for V2V services based on LTE sidelink
  • Non-Patent Document 4 RP-170798, New WID on 3GPP V2X Phase 2
  • Non-Patent Document 5 RP-181480, New SID Proposal: Study on NR V2X
  • the present invention provides a method performed by a user equipment and a user equipment.
  • a method performed by a user equipment includes: receiving a PSCCH sent by other sidelink communication user equipment and a corresponding PSSCH of the PSCCH; and determining a sequence of a sidelink communication phase tracking reference signal PT-RS.
  • determining the sequence of the phase tracking reference signal PT-RS for sideline communication includes: determining the sideline communication PT at least according to the number of the first OFDM symbol of the demodulation reference signal DMRS carrying the PSSCH in the time slot. - Sequence of RSs.
  • a method performed by a user equipment includes: acquiring first sideline communication configuration information, where the first sideline communication configuration information includes bandwidth segment configuration information for sideline communication; acquiring second sideline communication configuration information; line communication configuration information, the second side line communication configuration information includes resource pool information for side line communication; receiving PSCCH sent by other side line communication user equipment and the corresponding PSSCH of the PSCCH; and according to the first side
  • the information about the PT-RS of the sidelink communication is determined by the sidelink communication configuration information, the second sidelink communication configuration information, the PSCCH and the corresponding PSSCH.
  • determining the relevant information of the PT-RS of the sidelink communication includes: determining the sequence of the PT-RS of the sidelink communication; and/or determining the time domain resource mapping information of the PT-RS of the sidelink communication.
  • the PSCCH carries a first-level SCI
  • the sideline communication is determined according to the first sideline communication configuration information, the second sideline communication configuration information, the PSCCH and the corresponding PSSCH.
  • the relevant information of the PT-RS includes: determining whether the other user equipment has sent the PT-RS of the sideline communication according to at least the first-level SCI and the second sideline communication configuration information; When the other user equipment sends the PT-RS of the sidelink communication, determine the Information about the PT-RS of the sideline communication.
  • determining the relevant information of the PT-RS of the sidelink communication includes: According to the first sideline communication configuration information, the second sideline communication configuration information, the first-level SCI, and the corresponding PSSCH, a sequence of PT-RSs for sideline communication is determined.
  • the sequence of the PT-RS of the sideline communication is determined at least according to the symbol number in the time slot of the first OFDM symbol that actually transmits the demodulation reference signal DMRS of the corresponding PSSCH, and the first The OFDM symbol for actually transmitting the DMRS of the corresponding PSSCH is determined according to at least the first sideline communication configuration information, the first-level SCI and the second sideline communication configuration information.
  • the sequence of the PT-RS of the sideline communication is determined at least according to the symbol number in the time slot of the first OFDM symbol carrying the demodulation reference signal DMRS of the corresponding PSSCH, and the first carrying The OFDM symbol of the corresponding PSSCH demodulation reference signal DMRS is determined according to at least the first sideline communication configuration information, the first-level SCI, and the second sideline communication configuration information.
  • determining the relevant information of the PT-RS of the sidelink communication includes: determining a time-domain density L_(PT-RS) of the PT-RS of the sideline communication at least according to the first-level SCI and the second sideline communication configuration information; and at least according to any one of the actual transmissions of the corresponding The OFDM symbol where the DMRS of the PSSCH is located, any one of the OFDM symbols that carry the DMRS of the corresponding PSSCH, and the time domain density L_(PT-RS), determine the PT-RS of the sideline communication.
  • a set of time-domain OFDM symbols is used as the time-domain resource mapping information of the PT-RS for sidelink communication, wherein any one of the OFDM symbols of the DMRS that actually transmits the corresponding PSSCH or any one of the OFDM symbols that carry the corresponding PSSCH
  • the OFDM symbol of the DMRS is determined by at least the first sideline communication configuration information, the first-level SCI and the second sideline communication configuration information.
  • the first sideline communication configuration information is sent or preconfigured by the base station gNB.
  • the second sideline communication configuration information is sent or preconfigured by the base station gNB.
  • the first sideline communication configuration information includes at least start indication information and length indication information of an OFDM symbol used for sideline communication in one time slot.
  • the second sideline communication configuration information includes at least configuration information of the PT-RS for sideline communication.
  • Another aspect of the present invention provides a user equipment comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform the method according to the first aspect of the present invention.
  • the realization complexity of the user equipment can be reduced, and the channel demodulation performance can be improved.
  • the method for determining the sidelink PT-RS sequence of the sidelink communication phase tracking reference signal provided by the present invention, it can be ensured that the sending user equipment and the receiving user equipment can achieve the same way of generating the sequence of the sidelink PT-RS, and the user equipment does not need to
  • the reference signal is generated for the symbols that do not transmit the demodulation reference signal DMRS, which reduces the implementation complexity of the user equipment.
  • the density of the PT-RS in the time domain can be ensured, thereby improving the channel demodulation performance.
  • FIG. 1 is a schematic diagram illustrating sideline communication of an LTE V2X UE.
  • FIG. 2 is a schematic diagram illustrating a resource allocation manner of LTE V2X.
  • FIG. 3 is a schematic diagram illustrating a basic process of a method performed by a user equipment in Embodiment 1 of the invention.
  • FIG. 4 is a schematic diagram illustrating a basic process of a method executed by a user equipment in Embodiment 2 of the invention.
  • FIG. 5 is a block diagram illustrating a user equipment according to an embodiment of the present invention.
  • the 5G mobile communication system and its subsequent evolved versions are used as an example application environment to specifically describe various embodiments according to the present invention.
  • the present invention is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as communication systems after 5G and 4G mobile communication systems before 5G.
  • 3GPP 3rd Generation Partnership Project
  • the third generation partnership project the third generation partnership project
  • PDCCH Physical Downlink Control Channel, physical downlink control channel
  • DCI Downlink Control Information, downlink control information
  • PDSCH Physical Downlink Shared Channel, physical downlink shared channel
  • UE User Equipment, user equipment
  • eNB evolved NodeB, evolved base station
  • TTI Transmission Time Interval, transmission time interval
  • OFDM Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing
  • CP-OFDM Cyclic Prefix Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing with Cyclic Prefix
  • C-RNTI Cell Radio Network Temporary Identifier, the temporary identifier of the cell wireless network
  • CSI-RS Channel State Information Reference Signal, channel state information reference signal
  • CRS Cell Reference Signal, cell-specific reference signal
  • PUCCH Physical Uplink Control Channel, physical uplink control channel
  • PUSCH Physical Uplink Shared Channel, physical uplink shared channel
  • SCI Sidelink Control Information, side communication control information
  • PSCCH Physical Sidelink Control Channel, Physical Sidelink Communication Control Channel
  • MCS Modulation and Coding Scheme, modulation and coding scheme
  • RB Resource Block, resource block
  • CRB Common Resource Block, common resource block
  • PRB Physical Resource Block, physical resource block
  • PSSCH Physical Sidelink Shared Channel, physical side communication shared channel
  • FDM Frequency Division Multiplexing, frequency division multiplexing
  • RRC Radio Resource Control
  • RSRP Reference Signal Receiving Power, reference signal receiving power
  • SRS Sounding Reference Signal, sounding reference signal
  • CRC Cyclic Redundancy Check, Cyclic Redundancy Check
  • PSDCH Physical Sidelink Discovery Channel, Physical Sidelink Communication Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel, physical side communication broadcast channel
  • TDD Time Division Duplexing, time division duplexing
  • FDD Frequency Division Duplexing, frequency division duplexing
  • SIB1 System Information Block Type 1, system information block type 1
  • PSSS Primary Sidelink Synchronization Signal, side communication main synchronization signal
  • SSSS Secondary Sidelink Synchronization Signal, side communication secondary synchronization signal
  • PCI Physical Cell ID, physical cell identification
  • PSS Primary Synchronization Signal
  • GNSS Global Navigation Satellite System, global navigation satellite positioning system
  • SFN System Frame Number, system (wireless) frame number
  • DFN Direct Frame Number, direct frame number
  • SSB Synchronization Signal Block, synchronization system information block
  • EN-DC EUTRA-NR Dual Connection, LTE-NR dual connection
  • SCG Secondary Cell Group, secondary cell group
  • PCell Primary Cell, the main cell
  • SCell Secondary Cell, secondary cell
  • PSFCH Physical Sidelink Feedback Channel, Physical Sidelink Communication Feedback Channel
  • SPS Semi-Persistant Scheduling, semi-static scheduling
  • PT-RS Phase-Tracking Reference Signals, phase tracking reference signal
  • CB Code Block, coding block/code block
  • QPSK Quadrature Phase Shift Keying, quadrature phase shift keying
  • 16/64/256 QAM 16/64/256 Quadrature Amplitude Modulation, Quadrature Amplitude Modulation
  • AGC Auto Gain Control, automatic gain control
  • V2X in the text can also represent sidelink; similarly, sidelink in the text can also represent V2X, and no specific distinction or limitation will be made in the following text.
  • the resource allocation mode of V2X (sidelink) communication in the specification of the present invention and the transmission mode of V2X (sidelink) communication can be equivalently replaced.
  • the resource allocation method referred to in the specification may represent the transmission mode, and the transmission mode referred to may represent the resource allocation method.
  • the PSCCH in the specification of the present invention is used to carry the SCI.
  • the PSCCH involved in the description of the present invention corresponds to, or corresponds to, or is related to, or, the scheduled PSSCH indicates the same meaning, and both indicate associated PSSCH or corresponding PSSCH.
  • the PSSCH involved in the description corresponds to, or corresponds to, or has the same meaning as the related SCI (including the first-level SCI and the second-level SCI), which means associated SCI or corresponding SCI.
  • the first-level SCI is called 1st stage SCI and is transmitted in PSCCH;
  • the second-level SCI is called 2nd stage SCI and is transmitted in the corresponding PSSCH resources.
  • both UEs performing sidelink communication have network coverage (for example, the UE detects at least one cell that satisfies the "cell selection criterion" on the frequency where sidelink communication needs to be performed, Indicates that the UE has network coverage).
  • Partial-Coverage sidelink communication one of the UEs performing sidelink communication has no network coverage, and the other UE has network coverage.
  • the UE From the UE side, the UE has only two scenarios: no network coverage and network coverage. Part of the network coverage is described in terms of sidelink communication.
  • FIG. 1 is a schematic diagram illustrating sideline communication of an LTE V2X UE.
  • UE1 sends sideline communication control information (SCI format 1) to UE2, which is carried by the physical layer channel PSCCH.
  • SCI format 1 contains PSSCH scheduling information, such as PSSCH frequency domain resources.
  • UE1 sends sideline communication data to UE2, which is carried by the physical layer channel PSSCH.
  • the PSCCH and the corresponding PSSCH are in a frequency division multiplexing manner, that is, the PSCCH and the corresponding PSSCH are located in the same subframe in the time domain, and are located in different RBs in the frequency domain.
  • the specific design methods of PSCCH and PSSCH are as follows:
  • SCI format 1 can be carried in PSCCH, wherein SCI format 1 at least includes frequency domain resource information of PSSCH. For example, for the frequency domain resource indication field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of the PSSCH corresponding to the PSCCH.
  • PSSCH occupies one subframe in the time domain, and adopts frequency division multiplexing (FDM) with the corresponding PSCCH.
  • PSSCH occupies one or more consecutive sub-channels in the frequency domain, sub-channels represent n subCHsize consecutive RBs in the frequency domain, n subcHsize is configured by the RRC parameter, the number of starting sub-channels and consecutive sub-channels Indicated by the frequency domain resource indication field of SCI format 1.
  • FIG. 2 shows two resource allocation methods of LTE V2X, which are respectively called resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (Transmission Mode 4).
  • the base station can configure the resource allocation mode of the UE through UE-level dedicated RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, or the transmission mode of the UE. ,Specifically:
  • Resource allocation method based on base station scheduling indicates that the frequency domain resources used for sidelink communication come from the scheduling of the base station.
  • Transmission mode 3 includes two scheduling methods, namely dynamic scheduling and semi-persistent scheduling (SPS).
  • SPS semi-persistent scheduling
  • the UL grant (DCI format 5A) includes the frequency domain resources of PSSCH, and the CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by SL-V-RNTI.
  • the base station configures one or more (up to 8) configured scheduling grants (configured grants) through IE: SPS-ConfigSL-r14, each configured scheduling grant contains a scheduling grant number (index) and scheduling grants Licensed resource period.
  • the UL grant (DCI format 5A) includes the frequency domain resources of the PSSCH, and the indication information (3 bits) of the scheduling grant number and the indication information of the SPS activation (activate) or release (release, or deactivation).
  • the CRC of the PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-SPS-V-RNTI.
  • the RRC signaling SL-V2X-ConfigDedicated when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-r14, it indicates that the UE is configured as a transmission mode based on the base station scheduling.
  • the base station configures SL-V-RNTI or SL-SPS-V-RNTI through RRC signaling, and uses PDCCH or EPDCCH (DCI format 5A, the CRC is scrambled with SL-V-RNTI or scrambled with SL-SPS-V-RNTI) ) sends an uplink scheduling grant UL grant to the UE.
  • the above-mentioned uplink scheduling grant UL grant at least includes scheduling information of PSSCH frequency domain resources in sidelink communication.
  • the UE When the UE successfully monitors the PDCCH or EPDCCH scrambled by SL-V-RNTI or SL-SPS-V-RNTI, it uses the PSSCH frequency domain resource indication field in the uplink scheduling grant UL grant (DCI format 5A) as the PSCCH Indication information of the frequency domain resources of PSSCH in (SCI format 1), and send PSCCH (SCI format 1) and the corresponding PSSCH.
  • DCI format 5A the PSSCH frequency domain resource indication field in the uplink scheduling grant UL grant
  • the UE receives SL-SPS-V-RNTI scrambled DCI format 5A on downlink subframe n. If the indication information of SPS activation is included in the DCI format 5A, the UE determines the frequency domain resources of the PSSCH according to the indication information in the DCI format 5A, and determines the time domain resources of the PSSCH (the transmission subframe of the PSSCH) according to information such as subframe n.
  • Resource allocation method based on UE sensing indicates that the resources used for sidelink communication are based on the UE sensing process of the set of candidate available resources.
  • the RRC signaling SL-V2X-ConfigDedicated is set to ue-Selected-r14, it indicates that the UE is configured as the transmission mode based on UE sensing.
  • the base station configures the available transmission resource pool, and the UE determines the PSSCH sidelink transmission resources in the transmission resource pool (resource pool) according to certain rules (see the LTE V2X UE sensing process section for a detailed process description). , and send PSCCH (SCI format 1) and corresponding PSSCH.
  • the resources sent and received by the UE belong to the resource pool resource pool.
  • the base station schedules transmission resources for the sidelink UE in the resource pool, or, for the transmission mode based on UE perception in sidelink communication, the UE determines transmission resources in the resource pool.
  • the parameter set numerology includes the subcarrier spacing and the cyclic prefix CP length.
  • Table 4.2-1 shows the set of supported transmission parameters, as follows shown.
  • ⁇ ⁇ f 2 ⁇ ⁇ 15[kHz] CP (Cyclic Prefix) 0 15 normal 1 30 normal 2 60 normal, extended 3 120 normal 4 240 normal
  • each slot (slot) contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols.
  • LTE only supports subcarrier spacing of 15kHz.
  • Extended CP is supported in LTE, and normal CP is also supported.
  • the subframe subframe has a duration of 1ms and includes two slots, each of which has a duration of 0.5ms.
  • each subframe contains 14 OFDM symbols, and each slot in the subframe contains 7 OFDM symbols; for extended CP, each subframe contains 12 OFDM symbols, and each slot in the subframe contains 6 OFDM symbols.
  • the resource block RB is defined in the frequency domain as consecutive sub-carriers, eg for a sub-carrier spacing of 15 kHz, the RB is 180 kHz in the frequency domain.
  • the resource element RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.
  • PT-RS is used to track phase fluctuations over the entire transmission period (eg, one slot). Since PT-RS is designed to track phase noise, PT-RS is dense in the time domain and sparse in the frequency domain. PT-RS will only appear with DMRS, and PT-RS will only be sent if the network is configured with PT-RS.
  • the sidelink communication phase tracking reference signal sidelink PT-RS is introduced in the NR sidelink.
  • the user equipment performs phase tracking according to the received PT-RS to improve the demodulation performance.
  • the OFDM symbols available for sideline communication transmission in a time slot are jointly determined by RRC parameters sl-StartSymbol and sl-LengthSymbols.
  • the value range of sl-StartSymbol is 0 to 7 OFDM symbols, and the value range of sl-LengthSymbols is 7 to 14 OFDM symbols. For example, if sl-StartSymbol is configured as 3, and sl-LengthSymbols is configured as 9, in one slot, OFDM symbol 3 to OFDM symbol 11 can be used for sideline communication transmission.
  • ld represents the number of OFDM symbols for transmitting PSSCH in the NR sideline communication. It is worth noting that the number of OFDM symbols for transmitting PSSCH includes AGC symbols and does not include gap symbols (Gap symbols).
  • the AGC symbol represents the OFDM symbol corresponding to sl-StartSymbol
  • the interval symbol represents the OFDM symbol corresponding to (sl-StartSymbol+sl-LengthSymbols-1). Since ld does not contain the last symbol available for sideline communication, the value of ld ranges from 6 to 13.
  • the number in the DM-RS position in the table indicates the relative OFDM number relative to the OFDM symbol corresponding to sl-StartSymbol, that is, the OFDM symbol number corresponding to sl-StartSymbol is 0, and the number 1 indicates that the OFDM symbol corresponding to sl-StartSymbol is after the OFDM symbol. the next OFDM symbol.
  • the DMRS of the PSSCH will not be mapped in the resource block RB where the PSCCH (and the DMRS of the PSCCH) is located. It is worth noting that the time domain position of the PSSCH DMRS in the specification does not mean that there must be transmission of the PSSCH DMRS on the corresponding OFDM symbol.
  • DMRS not actually transmitted includes but is not limited to the above situations.
  • actually transmitted DMRS means a DMRS carrying a PSSCH on a certain OFDM symbol.
  • DMRS without actual transmission means DMRS that does not carry PSSCH on a certain OFDM symbol.
  • r(m) is equal to Among them, the sequence c(n) (corresponding to c in the above formula) is defined as:
  • x 1 (n+31) (x 1 (n+3)+x 1 (n))mod 2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n))mod 2
  • the above m represents a non-negative integer
  • j represents the basic unit of an imaginary number
  • a mod b represents the remainder obtained by dividing a by b
  • N c 1600.
  • the sequence c(n) represents a pseudo-random number sequence.
  • the user equipment determines r(m)
  • the user equipment needs to determine the values of c(2m) and c(2m+1).
  • c(20) needs to be determined.
  • the value of c(21). Determining the sequence c(n) requires simultaneously determining the sequences x 1 (n) and x 2 (n).
  • x 1 (31) to x 1 (61) can be determined.
  • x 1 (62) to x 1 (92) are derived from the determined x 1 (31) to x 1 (61), and so on.
  • the decimal representation of the initialization sequence for x 2 (n) is
  • FIG. 3 is a schematic diagram illustrating a basic process of a method performed by a user equipment according to Embodiment 1 of the present invention.
  • the steps performed by the user equipment include:
  • step S101 optionally, the sideline communication user equipment acquires first sideline communication configuration information.
  • the first sideline communication configuration information is sent by the base station gNB, or is pre-configured (pre-configuration).
  • the first sidelink communication configuration information at least includes indication information sl-StartSymbol and sl-LengthSymbols of OFDM symbols used for sidelink communication in a time slot.
  • step S102 the user equipment acquires second sideline communication configuration information.
  • the second sideline communication configuration information is sent by the base station gNB, or is pre-configured (pre-configuration).
  • the second sidelink communication configuration information at least includes configuration information of a sidelink communication phase tracking reference signal sidelink PT-RS.
  • step S103 optionally, the sideline communication user equipment receives the PSCCH and the corresponding PSSCH sent by other user equipments.
  • the PSCCH carries the first-level SCI; the corresponding PSSCH carries the second-level SCI.
  • the user equipment determines that the other user equipment has sent a sidelink communication phase tracking reference signal sidelink PT-RS according to at least the first-level SCI and the second sidelink communication configuration information, or determines The sidelink communication phase tracking reference signal sidelink PT-RS is present.
  • step S104 the sidelink communication user equipment determines the sequence of the sidelink PT-RS.
  • sequence r(m) of the sidelink PT-RS is equal to where the sequence c(n) is defined as:
  • x 1 (n+31) (x 1 (n+3)+x 1 (n))mod 2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n))mod 2
  • N c 1600
  • the initialization sequence of x 2 (n) is in is equal to the decimal value of the cyclic redundancy check code CRC of the PSCCH, represents the number of OFDM symbols in a slot, Indicates the slot number in the frame (of the sidelink PT-RS or the DMRS of the corresponding PSSCH).
  • l represents the symbol number in the time slot of the OFDM symbol of the demodulation reference signal DMRS of the corresponding PSSCH in the first actually transmitted,
  • 1 represents the symbol number in the time slot of the first OFDM symbol that carries the demodulation reference signal DMRS of the corresponding PSSCH.
  • the first OFDM symbol that actually transmits the DMRS of the corresponding PSSCH or the first OFDM symbol that carries the DMRS of the corresponding PSSCH is configured by at least the first sideline communication information, the first level SCI and the second sideline communication configuration information are determined.
  • FIG. 4 is a schematic diagram illustrating a basic process of a method performed by a user equipment according to Embodiment 2 of the present invention.
  • the steps performed by the user equipment include:
  • step S201 the sideline communication user equipment acquires the configuration information of the sideline communication.
  • the configuration information of the sideline communication is sent by the base station gNB, or is pre-configured (pre-configuration).
  • the configuration information of the sidelink communication at least includes indication information sl-StartSymbol and sl-LengthSymbols of the OFDM symbols used for the sidelink communication in a time slot.
  • step S202 the user equipment acquires second sideline communication configuration information.
  • the second sideline communication configuration information is sent by the base station gNB, or is pre-configured (pre-configuration).
  • the second sideline communication configuration information includes at least configuration information of a sidelink communication phase tracking reference signal sidelink PT-RS.
  • step S203 optionally, the sideline communication user equipment receives the PSCCH and the corresponding PSSCH sent by other user equipments.
  • the PSCCH carries the first-level SCI; the corresponding PSSCH carries the second-level SCI.
  • the user equipment determines that the other user equipment has sent a sidelink communication phase tracking reference signal sidelink PT-RS according to at least the first-level SCI and the second sidelink communication configuration information, or determines The sidelink communication phase tracking reference signal sidelink PT-RS is present.
  • the user equipment determines, according to at least the first-level SCI and the second sidelink communication configuration information, a time-domain density L PT-RS of the sidelink communication phase tracking reference signal sidelink PT-RS .
  • step S204 the sidelink communication user equipment determines a set of time-domain OFDM symbols of the sidelink PT-RS.
  • the method for the sidelink communication user equipment to determine the time-domain OFDM symbol set of the sidelink PT-RS includes but is not limited to the following:
  • step 2 If l ref + i ⁇ L PT-RS is within the OFDM symbol range for PSSCH transmission, then repeat the above steps from step 2.
  • any OFDM symbol that actually transmits the DMRS of the corresponding PSSCH or any OFDM symbol that carries the DMRS of the corresponding PSSCH is determined by at least the first sideline communication configuration information, The first-level SCI and the second sideline communication configuration information are determined.
  • FIG. 5 is a block diagram showing a user equipment UE according to the present invention.
  • the user equipment UE80 includes a processor 801 and a memory 802 .
  • the processor 801 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 802 may include, for example, volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like.
  • Program instructions are stored on the memory 802 . When the instructions are executed by the processor 801, the above method described in detail in the present invention and executed by the user equipment can be executed.
  • the method and related apparatus of the present invention have been described above with reference to the preferred embodiments. Those skilled in the art can understand that the methods shown above are only exemplary, and the various embodiments described above can be combined with each other under the condition that no contradiction occurs.
  • the method of the present invention is not limited to the steps and sequences shown above.
  • the network node and user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future and can be used for base stations, MMEs, or UEs, and so on.
  • the various identifiers shown above are only exemplary and not restrictive, and the present invention is not limited to the specific information elements exemplified by these identifiers. Numerous changes and modifications may occur to those skilled in the art in light of the teachings of the illustrated embodiments.
  • the above-described embodiments of the present invention may be implemented by software, hardware, or a combination of both.
  • the various components inside the base station and the user equipment in the above embodiments may be implemented by various devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processing Controllers, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (CPLDs), etc.
  • DSP digital signal processing
  • ASICs Application Specific Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • CPLDs Programmable Logic Devices
  • base station may refer to a mobile communication data and control switching center with larger transmit power and wider coverage area, including functions such as resource allocation and scheduling, data reception and transmission, etc.
  • User equipment may refer to a user mobile terminal, for example, including a mobile phone, a notebook, and other terminal equipment that can wirelessly communicate with a base station or a micro base station.
  • embodiments of the invention disclosed herein may be implemented on a computer program product.
  • the computer program product is a product having a computer-readable medium on which computer program logic is encoded that, when executed on a computing device, provides relevant operations to achieve The above technical solutions of the present invention.
  • computer program logic When executed on at least one processor of a computing system, computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention.
  • Such arrangements of the present invention are typically provided as software, code and/or other data structures arranged or encoded on a computer readable medium such as an optical medium (eg CD-ROM), floppy or hard disk, or such as one or more Firmware or other medium of microcode on a ROM or RAM or PROM chip, or a downloadable software image in one or more modules, a shared database, etc.
  • Software or firmware or such a configuration may be installed on a computing device, so that one or more processors in the computing device execute the technical solutions described in the embodiments of the present invention.
  • each functional module or each feature of the base station device and the terminal device used in each of the above embodiments may be implemented or executed by a circuit, which is usually one or more integrated circuits.
  • Circuits designed to perform the various functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs) or general purpose integrated circuits, field programmable gate arrays (FPGAs) or other Program logic devices, discrete gate or transistor logic, or discrete hardware components, or any combination of the above.
  • a general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine.
  • the general-purpose processor or each circuit described above may be configured by digital circuits, or may be configured by logic circuits.
  • the present invention can also use the integrated circuit obtained by using the advanced technology.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé exécuté par un équipement utilisateur et un équipement utilisateur. Le procédé comprend : la réception d'un canal PSCCH et d'un canal PSSCH correspondant au canal PSCCH, les deux canaux étant transmis par un autre équipement utilisateur ; et la détermination d'une séquence de signaux de référence de suivi de phase (PT-RS) de communication sur liaison latérale.
PCT/CN2021/123081 2020-10-14 2021-10-11 Procédé exécuté par un équipement utilisateur et équipement utilisateur WO2022078292A1 (fr)

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CN202011097236.3A CN114374483A (zh) 2020-10-14 2020-10-14 由用户设备执行的方法以及用户设备
CN202011097236.3 2020-10-14

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108282877A (zh) * 2017-01-06 2018-07-13 华为技术有限公司 一种参考信号的配置方法、装置及系统
CN109314686A (zh) * 2016-04-25 2019-02-05 Lg 电子株式会社 无线通信系统中估计相位噪声的信号传输方法
US20200052843A1 (en) * 2018-08-09 2020-02-13 FG Innovation Company Limited Method and apparatus for performing sidelink communication in wireless communication systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109314686A (zh) * 2016-04-25 2019-02-05 Lg 电子株式会社 无线通信系统中估计相位噪声的信号传输方法
CN108282877A (zh) * 2017-01-06 2018-07-13 华为技术有限公司 一种参考信号的配置方法、装置及系统
US20200052843A1 (en) * 2018-08-09 2020-02-13 FG Innovation Company Limited Method and apparatus for performing sidelink communication in wireless communication systems

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